ADHD is the most common behavioral disorder of childhood and a serious neuropsychiatric disorder. ADHD alone accounts for only 1/3 of cases, with up to 85% of ADHD having at least one co-occurring psychiatric disorder and about 60% of patients having two co-occurring psychiatric disorders. By co-morbidity, we mean that a child has two or more diseases or disorders at the same time. They can occur simultaneously or sequentially. Common co-occurring disorders in ADHD include: (1) oppositional defiant disorder: the child is often disobedient, oppositional, negative, irritable, hostile, and vindictive; (2) conduct disorder: frequent and repeated lying, fighting, truancy, vandalism, and abuse of others or small animals; (3) depressive disorder: persistent depressed mood, insomnia, tantrums, emotional instability, and loss of appetite; (4) anxiety (4) Anxiety disorders: often manifested as excessive worry, fidgeting, nervousness, refusal to go to school, physical discomfort, sleep disturbance, etc.; (5) Learning disorders: often manifested as learning difficulties, poor academic performance, poor reading, writing, arithmetic skills and normal intelligence of children; (6) Tic disorders: often manifested as sudden, involuntary, repeated, rapid movements of a body part, such as squeezing eyebrows, blinking, making strange faces, shaking head, shrugging shoulders The prognosis for children with co-occurring disorders is worse than that of ADHD alone, and the risk to society, families and children is greater. The need for timely, effective and long-term treatment is even greater.